The correct answer is commuter marriage.
Commuter marriage refers to the type of marriage which exists between two people who don't live together. In the case above, the husband lives in another city due to work, whereas his wife and kids live in their old city. However, he still comes to visit them as much as he can, when he is not working.
I don’t know why it was so successful at that
Because of its subordinate position in a capitalist society and the effects of periodic depression on wages and employment, the proletariat, as described by Marxists, was usually living in poverty.